Mahabharata 3.195.1

मार्कण्डेय उवाच · mārkaṇḍeya uvāca

धुन्धुर्नाम महातेजास्तयोः पुत्रो महाद्युतिःस तपोऽतप्यत महन्महावीर्यपराक्रमः

dhundhurnāma mahātejāstayoḥ putro mahādyutiḥsa tapo'tapyata mahanmahāvīryaparākramaḥ

Our plain-language meaning of this verse is waiting for scholar review.